The earliest fossil records of Bittacidae can date back to the Triassic, with a higher diversity during the Jurassic, and lower diversity in the Cretaceous. This paper based on four well-preserved new specimens of Bittacidae from the mid-Cretaceous Kachin amber in Northern Myanmar (Hukawng Valley), revised the diagnosis of Burmobittacus Zhao, Bashkuev, Chen & Wang, 2017, supplemented the features of head, the basal part of the wing, and genitalia of Burmobittacus jarzembowskii Zhao, Bashkuev, Chen & Wang, 2017, indicated a significant difference in the intraspecific length ratio between radial sector(R_S) and R₂₊₃. This paper also compiled a fossil genus-level key for the Bittacidae and compared the wing differences among fossil groups of Bittacidae from Mesozoic.

The research history of fossil Phasmatodea is reviewed in this paper, focusing on the current status of taxonomic and phylogenetic studies. The diversity, localities and ages of all reported fossil taxa of Phasmatodea all over the world are overviewed. The mimicry and defense behavior revealed by Phasmatodea fossils are summarized, involving their early evolution of wings and mimicry related body characters. The existing problems in the studies of fossil Phasmatodea are discussed, along with an outlook on future research of Phasmatodea.